ar or ak?

OK guys I am having a bit of trouble with the decision. I love both platforms and have been looking at a SIG m400 or a m70. Sigs are about $350 more but can buy locally. Ak would have to order but have plenty of ammo for it already with my SKS. Whats y'all's opinion? I hate when I get like this because ideally I would rather have both but that's not feasible.

There is nothing an M70 can do for you that an M400 will not. The AR is a superior semiauto. It will likely be easier to shoot accurately in a dynamic drill, more optic friendly off the bench, and easier to modify or upgrade. But then we don't always buy the best car for the money. We often go for what we like, charts and stats be damned. Rationally speaking, a semiauto AK based rifle is a niche product for (some) hunters and collectors.

I am personally not an AR fan. In fact, I generally prefer the AK platform. However, as Mercator pointed out, the AK platform is more of a niche, no matter how much AK fans would like it to be otherwise.

Here's what most any AR platform gets you - (I can't speak for the SIG specifically)
Easier to modify
Easier to mount optics
Easier maintenance (don't give me the crap about more small parts in the AR. You don't have to take them out to field strip.)
Generally more accurate (YMMV)
More and cheaper magazine options

I've heard the claim that 7.62mm WP is cheaper than 5.56mm NATO. In general, that is true, but actual .223 rounds generally run right about the same prce as the equivalent brand and type as 7.62mm WP. No price advantage to ammo between platforms. Also, with the ammo shortage more or less over, there are tons of .223 rounds on the shelf and a few brands of 7.62mm.

There are very good reasons these weapons are popular. You may get an AK and love it, or you may regret it and wonder what you missed. I may not care much for them, but I recognize them for what they are.

One plus to using an AR for home defense is that the .223/5.56 loses a lot of its punch after it goes through a Sheetrock wall. It's actually a better option than most handguns if your worried about your round passing through the BG hitting somebody in the next room.

Price wise between the Basic AK and AR your within $100 anyway so take your pick. I own both and I really dont have a favorite . Each has their benefits and down falls . Ammo is roughly the same price in my area , within a penny per round for FMJs . Both are really simple guns . Flip the coin you will eventually own both anyway.
Now saying that Im not a big fan of rifles having proprietary parts like the Piston ARs , if you need parts you may have to wait . DI rifles most any shops carry parts for them

Well I would really like the ar and love the feel and parts selection for them but I used to have a mac-90 and the paps are fairly cheap compared to ar's. Also have a bunch of ammo for the ak. Both do well out to the range I'm looking at. As far as walls go I live out in the country with my closest neighbor a 1/4 mile away or so. And yes I will eventually own both so I guess I will have to flip a coin!